Test pre-init public API, header portability and integration requests

Add tests/common/test_public_api.c: before yasl_init, argument errors are reported first, owner-thread calls fail with ENODEV, queries return their documented fallbacks, yasl_drop_next_path parses a crafted text/uri-list, yasl_get_system_string follows its length and NUL rules, and yasl_wake is a no-op with no display.

Build tests/test_header_c11.c as strict C11 and C17 with -pedantic-errors.

Extend the surface integration test, run on weston and Xwayland, with title, window requests, bell, desktop queries, drag cancel, input-less move/menu/drag calls, a popup (its parent's destroy must also remove it, checked through the display's surface list), and a clipboard round trip.

Run tests/x11/test_input.c in the X11 phase of run_surfaces.py through an optional trailing argument.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

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